Frances has been playing with light since she was 9 months old. She would often grab my booklight and look at it with a big smile on her face!
Over the years, she has developed many different ways of interacting with light and light-emitting toys.
One thing that she still loves to do is to turn switches on and off very rapidly over and over again.
Like many behaviours, this one has disappeared and reappeared several times.
We discourage it (for safety reasons) with explanations and distractions–other means of light play available to her are harmless.
But as long as she can play with light, she is happy!